• Proceedings of the KAIS Fall Conference
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• 2003.06a
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• pp.79-82
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• 2003

스위치 박스는 건축물의 전선관용으로 사용되는 금속제 박스이다. 이 박스를 제조할 때는 제 1차 프레스에서 성형을 하고, 제 2차～5차 프레스로 박스의 4측면 가공을 하게 되므로 프레스 4대, 금형 4벌, 작업자 4명을 필요로 한다. 이 때문에 기계 사용료와 금형비, 인건비 둥 제조원가의 상승 요인이 되고 있으며 특히 프레스의 굉음과 진동 및 안전사고의 위험성 등으로 작업자들이 직무를 기피하고 있다. 이러한 현상을 해소하기 위하여 금형 4벌에 의한 가공을 1벌의 금형에 통합시킨 캠금형 개발과 자동이송장치를 개발하였다. 그 결과, 프레스 1대와 금형 1벌로 무인화 작업을 할 수 있게 되어 직무기피요인을 해소하게 되고 제조원가 절감효과를 얻게 되었다

• Journal of the Korea Academia-Industrial cooperation Society
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• v.4 no.3
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• pp.121-125
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• 2003

A switch box is metal box for electric wire pipes in building. In manufacturing this box, the first press is used to mold and the second to fifth presses are used to process four-sides of a box. So four presses, four molds and four workers are needed. This leads to raise the manufacturing cost including machine lease rent, molding fee, and wages. To make matters worse, the roaring sound, vibration, and dangers of safety accidents make employees avoid from working that job. To solve this problem, a new Handling Mechanism and a cam die which combined four-die-involving processes into one die process were developed. That results job automation of the Job with one press and one die. The job avoidance problem is solved and manufacturing cost is reduced as well.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.6 no.6
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• pp.560-565
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• 2005

This paper deals with the development of manually operated die used for the manufacture of octagonal boxes into two sets of automated die. In particular, theoctagonal boxes are used fur the switch boxes intended fur the cable conduit of buildings or f3r wiring connection. Manufacturing these boxes requires forming the materials using the primary press before they undergo 2nd through 6th processing by the press machine including the four sides of the octagonal outlet box and bending. Such complicated process hikes up labor cost, slows down production, and results in defect rate of $10\%$ or higher; hence the overall rise in manufacturing cost. Moreover, workers avoid this type of work due to the roar and vibration coming from the press and the risk of accident. To eliminate such phenomenon, a CAM die made by integrating five sets of die into one set of die and an automatic conveyor system were developed. As a result, unmanned work was realized with only two units of press and two sets of die; thus solving the problem of work being avoided and saving on manufacturing cost.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.2 no.1
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• pp.69-74
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• 2003

The purpose of the present paper is to investigate about the machining of profile (core/cavity) of mold die using the commercial CAM system. Recently the requirement of the light weight and high performance of automobiles has Increased. The weight of the automobile is very important in the viewpoint of the fuel and traveling performance. The optimal design technique, material technique, the process design for parts and specially, die machining technique need to be developed for increasing productivity and reducing production time of the automobile parts. In this study, the effect of machining condition on precision of die profile is investigated by experimental observation and analysis. The results will be reflected for development of the precision die of the automobile.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2000.11a
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• pp.559-562
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• 2000

Bending is one of the most common cold-stamping operations, recently it is many used to produce structural frame. Depending on the shape and dimensions of complex structural frame, a successive bending operation with simple dies may be economic. But, in this paper, it has been focused to reduce the bending operations by a successive-action compound die. Designed compound-die consists of blank-holder, cam, wedge and etc. In the result, this compound-die for structural frame enabled that it makes seven bending processes into one process, and improved productivity.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.10 no.5
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• pp.71-77
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• 2001

On-machine measuring system of Numerically Control(NC) machines permit computer control of basic material cutting processes of moulds. A part of mould designed within a CAD/CAM system can be manufactured by generation of tool paths by the measuring systems. Since the three-dimensional geometry by AutoCAD of the part is contained in the data base, the manufacturing specialist combined with the appropriate software simulation, can not only create the commands to drive the virtual measuring and standardization of measuring modules but also can check for mistakes by viewing the computer graphics simulation of the tool cutting sequence.

• Journal of the Korean Society for Precision Engineering
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• v.23 no.4 s.181
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• pp.99-108
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• 2006

Since mold industries are regarded as belonging to three types of bad business, capable young people are reluctant to work in this field. The industries are hard to employ skilled workers who have much experience and knowledge On the mold manufacturing. Thus, effective CAM systems are required for unskilled workers to create process plans and NC data for the manufacturing, and process plans play important roles in the downstream manufacturing processes, such as NC machining, polishing, and final assembly. This study proposes a decision support system that facilitates unskilled workers to easily select high quality NC-data, as well as to increase productivity. The proposed system is assumed to follow a CAM operation scenario that consists of next three steps: 1) identifying several process plans and enumerating feasible unit machining operations (UMOs) from material and part surface information, 2) creating all feasible NC-data based on UMOs using a commercial CAM system, 3) selecting the best NC data among the feasible NC data using four screening criteria, such as machining accuracy, machining allowance, cutting load, and processing time. A case study on the machining of a camera core mold is provided to demonstrate the proposed system.

• Transactions of the Korean Society of Mechanical Engineers
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• v.11 no.1
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• pp.110-117
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• 1987

A new kinematically admissible velocity field for a generalized three-dimensional flow is introduced, in which the flow is bounded by an analytic die-profile function. Then, by applying the upper-bound method th the velocity field, the flow patterns as the upper-bound method are obtained. Extrusion of elliptic sections from round billets is chosen as a computational example. Computation and experiments are carried out for work-hardening material such as aluminum alloy 2024. In order to visualize the plastic flow, the grid marking technique is employed. The theoretical predictions both in extrusion load and deformed pattern are in good agreement with the experimental data.